CN112305765A

CN112305765A - Optical device and augmented reality display apparatus

Info

Publication number: CN112305765A
Application number: CN202011212956.XA
Authority: CN
Inventors: 杨柏儒; 陈俊伟; 吴梓毅; 许嘉哲; 龚又又
Original assignee: Sun Yat Sen University
Current assignee: Sun Yat Sen University
Priority date: 2020-11-03
Filing date: 2020-11-03
Publication date: 2021-02-02
Anticipated expiration: 2040-11-03
Also published as: CN112305765B

Abstract

The embodiment of the application provides an optical device and augmented reality display device, relates to optics field, and this optical device includes: the device comprises an adjustable optical element, a light sensing module and an adjusting module; the light sensing module is connected with the adjusting module and is used for detecting the intensity of external ambient light; the adjusting module is connected with the adjustable optical element and is used for adjusting the adjustable optical element to enable one surface of the adjustable optical element to be light color and the other surface of the adjustable optical element to be dark color when the intensity of the ambient light is higher than a preset threshold value; and when the intensity of the ambient light is lower than a preset threshold value, the adjustable optical element is adjusted to be colorless. The technical scheme can adaptively adjust the color of the adjustable optical element according to the intensity of the ambient light, and adaptively adjust the light transmittance and the reflectivity of the adjustable optical element.

Description

Optical device and augmented reality display apparatus

Technical Field

The embodiment of the application relates to the field of optics, in particular to an optical device and an augmented reality display device.

Background

An AR (Augmented Reality) display device is a wearable device which can be worn on the head of a human body for displaying by realizing an AR technology, virtual information can be superposed to the real world through a computer technology, so that a real environment and a virtual object can be superposed to the same picture in real time, mutual complementation of the two kinds of information is realized, and picture display is carried out in front of a user through a helmet, glasses and other devices, so that the Reality sense of the user is enhanced.

In the related art, the display lens of the AR display device is designed by adopting a transparent lens, a layer of light shield can be arranged outside the display lens, and the light transmittance of the light shield is constant.

Among the above-mentioned correlation technique, when the user is in the environment that the illumination is stronger such as open air, the virtual picture luminance that AR equipment shows is lower than the luminance of external environment light, and the user can't see the virtual picture clearly, and simultaneously, the transmittance of lens hood is invariable, and under the darker circumstances of illumination such as indoor, screen brightness is higher, and the very big partly absorbed by the lens hood of picture light that external object printing opacity lens hood introduced into people's eye into behind the light-tight lens hood, luminance is lower to make the user can't see the external picture clearly.

Disclosure of Invention

The present application aims to solve at least one of the above technical drawbacks, particularly the problem that when the illumination intensity is strong or weak, the contrast of the image is affected and the virtual picture or the real picture cannot be seen clearly.

In a first aspect, an embodiment of the present application provides an optical apparatus, including: the device comprises an adjustable optical element, a light sensing module and an adjusting module; the adjustable optical element is a film-shaped adjustable optical element;

the light sensing module is connected with the adjusting module and is used for detecting the intensity of external ambient light;

the adjusting module is connected with the adjustable optical element and is used for adjusting the adjustable optical element to enable one surface of the adjustable optical element to be light color and the other surface of the adjustable optical element to be dark color when the intensity of the ambient light is higher than a preset threshold value; and when the intensity of the ambient light is lower than a preset threshold value, the adjustable optical element is adjusted to be colorless.

In an embodiment, the adjusting module is further configured to adjust the adjustable optical element such that a partial area of one side of the adjustable optical element is light-colored and a partial area of the other side of the adjustable optical element is dark-colored.

In one embodiment, the adjustable optical element comprises a first transparent substrate, a dielectric layer and a second transparent substrate, the dielectric layer is positioned between the first transparent substrate and the second transparent substrate, and at least one of the first transparent substrate and the second transparent substrate is provided with a patterned transparent electrode;

the dielectric layer comprises light-colored charged particles, dark-colored charged particles and transparent dispersion liquid; the light-color charged particles and the dark-color charged particles are dispersed in the transparent dispersion liquid and are packaged in the closed cavity.

In one embodiment, the transparent electrode comprises a surface electrode and at least two strip-shaped electrodes distributed at intervals, and the surface electrode and the strip-shaped electrodes are insulated from each other;

the strip-shaped electrodes on the first transparent substrate correspond to the strip-shaped electrodes on the second transparent substrate one to one.

In an embodiment, the adjustment module comprises a first drive unit and a second drive unit;

the first driving unit is connected with the adjustable optical element and used for applying a first electric signal to drive the light-color charged particles and the dark-color charged particles to move towards a direction perpendicular to the first transparent substrate or the second substrate, so that the light-color charged particles are gathered on one surface of the first transparent substrate or the second transparent substrate close to the adjustable optical element to enable the surface to show a light color, and the dark-color charged particles are gathered on the other surface of the first transparent substrate or the second transparent substrate close to the adjustable optical element to enable the other surface to show a dark color;

the second driving unit is connected with the adjustable optical element and used for applying a second electric signal to drive the light-color charged particles and the dark-color charged particles to move in a direction parallel to the first transparent substrate and the second substrate, so that the light-color charged particles and the dark-color charged particles are gathered on a surface, close to the side surface of the adjustable optical element, in the closed cavity, and the adjustable optical element is colorless.

In an embodiment, the adjustable optical element comprises an e-paper film layer element and an electrowetting film layer element.

In an embodiment, the optical device further comprises: a transparent lens;

the adjustable optical element is embedded within the transparent lens; alternatively, the adjustable optical element is applied to the surface of the transparent lens.

In a second aspect, an embodiment of the present application further provides an augmented reality display apparatus, including the optical device as mentioned in any embodiment of the first aspect, further including a display lens; the adjustable optical element is positioned on the transparent display lens;

the display lens is used for transmitting real image light from the external environment;

the adjusting module is connected with the adjustable optical element and is used for adjusting the adjustable optical element to enable one side, close to human eyes, of the adjustable optical element to be light-colored and one side, far away from the human eyes, of the adjustable optical element to be dark-colored when the intensity of the ambient light is higher than a preset threshold value; when the ambient light intensity is lower than a preset threshold value, the adjustable optical element is adjusted to be colorless, so that the transmittance of the real image light penetrating through the display lens is changed.

In an embodiment, the augmented reality display device further comprises: an image projector;

the image projector is used for acquiring a locally stored virtual image and projecting virtual image light rays corresponding to the virtual image onto the reflecting surface of the display lens;

the display lens is also used for reflecting the virtual image light rays so that the virtual image light rays are reflected to enter human eyes;

the adjustable optical element is further used for changing the reflectivity of the virtual image light on the display lens.

In an embodiment, the augmented reality display device further comprises: a processing module;

the processing module is connected with the adjusting module and used for calculating a difference value between the ambient light intensity and the preset threshold value, and obtaining a driving electric signal of a corresponding grade according to the difference value so as to control the adjusting module to adjust the adjustable optical element at the driving electric signal of the grade.

In an embodiment, the augmented reality display device further comprises: the camera and the image processing module;

the camera is used for collecting a real image corresponding to the real image light after penetrating through the display lens;

the image processing module is connected with the camera and used for acquiring the real image and the locally stored virtual image, fusing the real image and the virtual image and rendering to obtain an augmented reality display picture.

The optical device and the augmented reality display device provided by the embodiment comprise: the device comprises an adjustable optical element, a light sensing module and an adjusting module; the light sensing module is connected with the adjusting module and is used for detecting the intensity of external ambient light; the adjusting module is connected with the adjustable optical element and is used for adjusting the adjustable optical element to enable one surface of the adjustable optical element to be light color and the other surface of the adjustable optical element to be dark color when the intensity of the ambient light is higher than a preset threshold value; and when the intensity of the ambient light is lower than a preset threshold value, the adjustable optical element is adjusted to be colorless. This technical scheme can be according to the colour of adjustable optical element of ambient light intensity suitability ground to when making ambient light intensity be higher than predetermineeing the threshold value, adjustable optical element's one side demonstrates the dark and reduces the luminousness, and the another side demonstrates the light and increases the light reflectivity, and when ambient light intensity was less than predetermineeing the threshold value, adjustable optical element demonstrates the colourless, improves light luminousness, thereby realizes the luminousness and the reflectivity of adjustable optical element of suitability ground.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic diagram of an optical device according to an embodiment;

FIG. 2A is a schematic diagram of another embodiment of an optical device;

FIG. 2B is a schematic diagram of another embodiment of an optical device;

fig. 3 is a schematic structural diagram of an augmented reality display device according to an embodiment;

FIG. 4 is a schematic diagram of an AR eye according to an embodiment;

FIG. 5 is a first functional schematic diagram based on an adjustable optical element in an AR eye;

fig. 6 is a second functional diagram based on an adjustable optical element in an AR eye.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.

Example one

Fig. 1 is a schematic structural diagram of an optical device according to an embodiment, and as shown in fig. 1, the optical device 10 includes: an adjustable optical element 110, a light sensing module 120, and an adjustment module 130. The adjustable optical element is a film-like adjustable optical element.

The light sensing module 120 is connected to the adjusting module 130, and is configured to detect an ambient light intensity of the outside; the adjusting module 130 is connected to the adjustable optical element 110, and is configured to adjust the adjustable optical element 110 so that one surface of the adjustable optical element 110 is light and the other surface is dark when the intensity of the ambient light is higher than a preset threshold; when the intensity of the ambient light is lower than the predetermined threshold, the adjustable optical element 110 is adjusted to be colorless.

The adjustable optical element 110 is an optical element, which is in a film layer or a sheet shape, and can change its light transmittance and light reflectance under the driving of an electrical signal, thereby achieving an adjustable effect.

In an embodiment, the adjustable optical element 110 exhibits different colors driven by an electrical signal, such as dark, light, and colorless, and the dark side has a strong absorption power for light to affect light transmittance, and the light side has a strong reflection power for light to affect light reflectance. It should be noted that colorless is relative to dark and light colors. In the present embodiment, colorless can be understood as a transparent state.

In this embodiment, the optical device 10 may apply a corresponding electrical signal to the adjustable optical element 100 according to the intensity of the ambient light, so that when the intensity of the ambient light is higher, the adjustable optical element can absorb more light rays to reduce the transmittance, and when the intensity of the ambient light is lower, the adjustable optical element 110 can absorb less light rays to allow more light rays to pass through as much as possible, thereby improving the transmittance.

Specifically, in the present embodiment, the light sensing module 120 detects an ambient light intensity of the outside, and transmits the detected ambient light intensity to the adjusting module 130. The adjustment module 130 compares the ambient light intensity to a preset threshold. The preset threshold value may be set according to the personal actual situation of the user, or may be a default numerical value of the system. Alternatively, the preset threshold may be a standard ambient light intensity or other physical quantity corresponding to the standard light intensity.

When the intensity of the ambient light is higher than the preset threshold, the adjustable optical element 110 is adjusted by the adjusting module 120 so that one side of the adjustable optical element presents a light color and the other side presents a dark color. Alternatively, the entire area of one side of the adjustable optical element may be light and the entire area of the other side dark; alternatively, a partial region on one side may be light and a partial region on the other side may be dark.

The side of the adjustable optical element with the dark color has high light absorption characteristics for light, and the side with the light color has high light reflection characteristics. Wherein, dark color is dark color such as black, gray, brown and the like, and light color is bright color such as white, yellow, apricot and the like.

Generally, the darker the color, the better the light absorption properties, i.e. the lower the light transmittance, the lighter the color, the brighter the light reflection properties, i.e. the higher the reflectivity. In some embodiments, the dark color is black and the light color is white.

When the intensity of the ambient light is lower than the preset threshold, the adjustable optical element 110 is adjusted by the adjusting module 120 to make the adjustable optical element 110 appear colorless, so that the ambient light can be transmitted to the maximum extent.

The optical device provided by the embodiment can adaptively adjust the color of the optical element according to the intensity of the ambient light, so that when the intensity of the ambient light is higher than a preset threshold value, one surface of the adjustable optical element presents a dark color, and the other surface presents a light color.

For the adjustable optical element 110, in an embodiment, the adjustable optical element 110 includes a first transparent substrate, a dielectric layer and a second transparent substrate, the dielectric layer is located between the first transparent substrate and the second transparent substrate, and at least one of the first transparent substrate and the second transparent substrate is provided with a patterned transparent electrode; the dielectric layer comprises light-colored charged particles, dark-colored charged particles and transparent dispersion liquid; the light-color charged particles and the dark-color charged particles are dispersed in the transparent dispersion liquid and are packaged in the closed cavity. The light colored charged particles and the dark colored charged particles can move freely in the transparent dispersion. When a setting electrical signal, such as a setting square wave electrical signal, is applied to the adjustable optical element 110, the charged particles of light color and the charged particles of dark color can be directionally moved in the transparent dispersion liquid, and the direction and speed of the directional movement are related to the magnitude waveform of the applied electrical signal and the position where the transparent electrode is disposed.

In this embodiment, the transparent electrode may be disposed on the first transparent substrate or the second transparent substrate, or may be disposed on both the first transparent substrate and the second transparent substrate, and the transparent electrode may be a patterned electrode, such as a circular ring, a circle, a fork, a rectangle, or the like. In an embodiment, the adjustable optical element 110 may be a film-like element, such as a sheet-like element, and the adjustable optical element 110 may include upper and lower substrates disposed opposite to each other, and a transparent electrode layer disposed opposite to each other between the upper and lower substrates, wherein the light-colored charged particles, the dark-colored charged particles, and the transparent dispersion are disposed between the transparent electrode layers and are enclosed in a closed cavity to prevent the light-colored charged particles, the dark-colored charged particles, and the transparent dispersion from leaking.

In an embodiment, the adjusting module 120 includes a first driving unit and a second driving unit, the first driving unit is connected to the adjustable optical element and configured to apply a first electrical signal to drive the light-colored charged particles and the dark-colored charged particles to move in a direction perpendicular to the first transparent substrate or the second substrate, so that the light-colored charged particles are collected on one of the first transparent substrate or the second transparent substrate in the closed cavity close to the adjustable optical element to make the one side appear light-colored, and the dark-colored charged particles are collected on the other one of the first transparent substrate or the second transparent substrate in the closed cavity close to the adjustable optical element to make the other side appear dark-colored. The second driving unit is connected with the adjustable optical element and used for applying a second electric signal to drive the light-color charged particles and the dark-color charged particles to move in a direction parallel to the first transparent substrate and the second transparent substrate, so that the light-color charged particles and the dark-color charged particles are gathered on a surface, close to the side face of the adjustable optical element, in the closed cavity, and the adjustable optical element is colorless.

Alternatively, the first electrical signal and the second electrical signal may be voltage signals, or current signals, of equal or different magnitudes. The first and second electrical signals may be applied at different positions to cause different directional movement of the light colored charged particles and the dark colored charged particles.

In one embodiment, the transparent electrodes include surface electrodes and strip-shaped electrodes arranged at intervals, the surface electrodes and the strip-shaped electrodes are insulated from each other, and the strip-shaped electrodes on the first transparent substrate and the strip-shaped electrodes on the second transparent substrate correspond to each other one to one. As shown in fig. 2A, fig. 2A is another schematic structural diagram of an optical device according to an embodiment; the first transparent substrate 201a and the second transparent substrate 201b are provided with surface electrodes 202, respectively, the surface electrodes 202 are provided with strip-shaped electrodes 203 arranged at intervals, and insulating layers (not shown) are provided between the surface electrodes 202 and between the strip-shaped electrodes 203.

When positive and negative electric signals are respectively applied to the surface electrodes on the first transparent substrate 201a and the second transparent substrate 201b, at this time, the light-colored charged particles 204 and the dark-colored charged particles 205 respectively move in a direction perpendicular to the first transparent substrate 201a or the second transparent substrate 201b, and referring to fig. 2A, the light-colored charged particles 204 are gathered at a position of the microcapsule cavity 206 close to the first transparent substrate 201a, so that the surface of the adjustable optical element close to the first transparent substrate 201a shows a light color, and the dark-colored charged particles 205 are gathered at a position of the microcapsule cavity 206 close to the second transparent substrate 201b, so that the surface of the adjustable optical element close to the second transparent substrate 201b shows a dark color.

When electrical signals with opposite polarities are applied to the strip-shaped electrodes 203 on the same first transparent substrate 201a and the second transparent substrate 201b at intervals, and the polarities of the electrical signals applied to the strip-shaped electrodes of the first transparent substrate 201a and the strip-shaped electrodes 203 on the second transparent substrate 201b corresponding to the first transparent substrate 201a are the same, for example, a positive electrical signal is applied to the first strip-shaped electrodes 203, a negative electrical signal is applied to the second strip-shaped electrodes 203, a positive electrical signal is applied to the third strip-shaped electrodes 203, and so on of the first transparent substrate 201 a/the second transparent substrate 201 b. At this time, the light-color charged particles 204 and the dark-color charged particles 205 move to a direction horizontal to the first transparent substrate 201a or the second transparent substrate 201B, as shown in fig. 2B, the light-color charged particles 204 are gathered at a side of the microcapsule cavity close to the positively-charged strip-shaped electrode 203, and the dark-color charged particles 205 are gathered at a side of the microcapsule cavity close to the negatively-charged strip-shaped electrode 203, so that no dark-color charged particles 205 or light-color charged particles 204 are distributed in the middle of the microcapsule cavity to present a transparent gap, thereby making the adjustable optical element appear colorless and facilitating light to transmit through the transparent gap.

It should be noted that the diameters of the dark charged particles 205 and the light charged particles 204 are very small, and even if the density is high when the dark charged particles and the light charged particles are concentrated on the side wall of the microcapsule cavity, the influence of the fine dark or light fine lines on the transparent state is negligible, and when the microcapsule is applied to display application, the influence on the display effect is very small and can be ignored to a certain extent.

In other embodiments, the closed cavity may be a micro-cup cavity in addition to the microcapsule cavity, and the specific implementation principle may refer to the above embodiments, which are not described in detail herein.

In one embodiment, the adjustable optical element includes an e-paper film layer element and an electrowetting film layer element.

For electronic paper film layer elements, it may include: transparent suspension, dark electrophoretic particles and light electrophoretic particles; the light electrophoretic particles and the dark electrophoretic particles are dispersed in a transparent suspension.

Alternatively, the description will be made by taking white electrophoretic particles and black electrophoretic particles as examples. When no voltage or zero voltage is applied, the black electrophoretic particles are uniformly dispersed in the transparent suspension, and when the voltage is applied, the black electrophoretic particles or the white electrophoretic particles regularly move according to the position and the shape of the transparent electrode layer and are gathered in the set area, so that the set area is in a black state or a white state, and the rest area is in a transparent state due to the absence of the black electrophoretic particles. The light is absorbed more through the black area, the light is reflected more through the white area, and the light is transmitted through the area showing the transparent state, so that the color of the adjustable optical element can be adjusted dynamically and adaptively, the area of the adjustable optical element through which the light transmits is changed dynamically, and the light transmittance and the reflectivity of the adjustable optical element are adjusted accordingly.

For an electrowetting film layer element, it may comprise a first fluid and a second fluid that are immiscible with each other; one of the first fluid and the second fluid comprises a clear fluid and the other comprises a dark fluid.

Alternatively, a black oily fluid and a transparent aqueous fluid are exemplified. When the first fluid is in contact with the transparent electrode layer and a voltage is applied to the first fluid through the transparent electrode layer, the first fluid is a black fluid, which can be a black oily hydrophobic dielectric, and the second fluid is a colorless transparent aqueous substance.

When no voltage or zero voltage is applied, the black oily fluid is uniformly spread out, so that one side of the adjustable optical element is in a black state, and the light absorption capacity is strongest. When voltage is applied, the black oily fluid moves and is gathered on a local area of the adjustable optical element, so that the local area presents a black state, and the rest area presents a transparent state, and the light absorption area of the adjustable optical element is dynamically adjusted. The light is absorbed through the black area and transmitted through the transparent area, so that the color of the optical element can be dynamically adjusted in a fitting manner, the area of the optical element through which the light penetrates is dynamically changed, and the light transmittance of the adjustable optical element is adjusted.

In an embodiment, the optical device further comprises a transparent lens. The adjustable optical element is embedded within the transparent lens; alternatively, the adjustable optical element is applied to the surface of the transparent lens.

In this embodiment, the transparent lens may be a sheet lens, and the adjustable optical element may be embedded within the transparent lens to protect the adjustable optical element through the transparent lens. In another embodiment, the adjustable optical element is applied to the surface of the transparent lens. Alternatively, the adjustable optical element may be one or more pieces.

Example two

Fig. 3 is a schematic structural diagram of an augmented reality display device provided in an embodiment, and as shown in fig. 3, the augmented reality display device 20 may include the optical device provided in any one of the embodiments above, and may further include a transparent display lens.

Wherein the adjustable optical element 110 is located on the transparent display lens 210;

the display lens 210 is configured to transmit real image light from an external environment;

the light sensing module 120 is connected to the adjusting module 130, and is configured to detect an ambient light intensity of the outside;

the adjusting module 130 is connected to the adjustable optical element 110, and is configured to adjust the adjustable optical element 110 so that a side of the adjustable optical element 110 close to a human eye is light and a side of the adjustable optical element away from the human eye is dark when the intensity of the ambient light is higher than a preset threshold; when the ambient light intensity is lower than the preset threshold, the adjustable optical element 110 is adjusted to be colorless, so as to change the transmittance of the real image light passing through the display lens.

For augmented reality display devices (AR display devices), including but not limited to display lens 210, adjustable optical element 110, light sensing module 120, and adjustment module 130, etc., the augmented reality display device may also include some supporting components, such as a frame, etc. In this embodiment, the augmented reality display device combines the real image light and the virtual image light by transmitting the real image light from the real object in the external environment and the virtual image light projected by the reflective image projector, so as to obtain an augmented reality display picture.

Taking AR glasses as an example for illustration, the AR glasses may include a lens frame, and may further include a display lens 210, where the display lens 210 is of a transparent design, so that real image light emitted by an external real object can pass through the display lens 210. Meanwhile, a reflective material is disposed in one surface of the display lens 210, and can reflect light to enable human eyes.

Optionally, the display lens is flexible, bendable, thin-film, and can be attached to any curved surface, and can also be applied to portable devices.

The light sensing module 120 includes a light sensing element, which may be disposed on the display lens or on the lens frame, and can sensitively detect the change of the ambient light intensity around the AR glasses. It should be noted that the light sensor module 120 has a small volume, and the light sensor module is disposed at a position where it can conveniently and accurately detect the intensity of the ambient light far away from the human eye.

The intensity of the ambient light far away from the human eye side detected by the light sensing module 120 is transmitted to the adjusting module, so that the intensity of the ambient light far away from the human eye side is compared with a preset threshold value through the adjusting module to obtain an electric signal output to the adjustable optical element, and the transmittance and the reflectivity of the adjustable optical element are adjusted under the driving action of the electric signal, so that the contrast of a display picture is optimal.

In an embodiment, the preset threshold may be set according to the personal actual situation of the user, or may be a default value of the system. Alternatively, the preset threshold may be a standard ambient light intensity or other physical quantity corresponding to the standard light intensity. Because different users have different requirements on the contrast, the users can set different contrasts according to actual needs to obtain preset threshold values corresponding to the contrasts, such as standard ambient light intensity.

The adjustable optical element 110 can change the transmittance and the reflectance under the action of the adjusting module according to the intensity of the ambient light detected by the light sensing module 120. Specifically, when the intensity of the ambient light is higher than the preset threshold, the adjusting module 130 applies a corresponding electrical signal to the adjustable optical element 110, and adjusts the adjustable optical element 110 such that the optical element is close to the human eye to have a light color and the side away from the human eye to have a dark color.

In an embodiment, the darker the color of the dark side of the adjustable optical element 110, the greater the ability to absorb real image light, and the lighter the color of the light side of the adjustable optical element 110, the greater the ability to reflect virtual image light.

When the ambient light intensity is higher than the preset threshold, the side of the adjustable optical element 110 away from the human eyes presents a dark color, and at this time, the real image light emitted by the external real object can be absorbed by the dark color side of the adjustable optical element 110 on the display lens 210, so that the light transmittance of the display lens 210 is reduced, the real image light is reduced, and excessive real image light is prevented from being transmitted in the display area; meanwhile, the virtual image light is reflected by the light surface of the adjustable optical element 110, and the light surface has higher light reflection capability, so that more virtual image light can be reflected, the reflectivity of the display lens 210 is improved, the virtual image light is increased, the contrast of a display picture is improved, and the quality of the display picture is improved.

When the intensity of the ambient light is lower than the predetermined threshold, the adjustable optical element 110 is adjusted to be colorless. At this time, the colorless adjustable optical element 110 is similar to the transparent display lens 210, and the real image light emitted from the external environment can penetrate through the colorless adjustable optical element 110, so that the real image light can normally penetrate through the display lens 210 and is hardly influenced by the adjustable optical element.

It should be noted that the colorless state is relatively dark and light, and in this embodiment, the colorless state may be optionally the same as the color of the display lens, for example, if the display lens is a yellow glass lens, the colorless state of the adjustable optical element exhibits a yellow color.

Under outdoor environment, the external environment light intensity is strong, the adjustable optical element 110 darkens, the side far away from human eyes presents dark color, the light transmittance is reduced, the strong light (namely real image light) of the external environment is prevented from entering the human eyes, the side close to the human eyes presents light color, the reflectivity is improved, the virtual image light entering the human eyes is enhanced, the contrast ratio of the virtual image picture and the external real picture is improved, and a user can more clearly see the virtual image picture. In an indoor scene, the intensity of the external ambient light is weak, the adjustable optical element 100 does not darken, and is in a transparent state, enough external ambient light is transmitted into human eyes, and a user can see the external real picture through the transparent adjustable optical element.

It should be noted that, in the present embodiment, the side far from the human eye may be in a transparent state in a dark color, and the side near the human eye may be in a transparent state in a light color.

The augmented reality display device provided by the embodiment comprises a display lens, an adjustable optical element, a light sensing module and an adjusting module, wherein the adjustable optical element is positioned on the transparent display lens, and the light sensing module detects the intensity of ambient light; the adjusting module is higher than the threshold value regulation adjustable optical element of predetermineeing at ambient light intensity, so that adjustable optical element is close to people's eye one side and is the light colour and keep away from people's eye one side and be the dark colour, be less than the threshold value of predetermineeing when ambient light intensity, it is colourless to adjust adjustable optical element, effectively solve under the outdoor scene that light is stronger virtual image picture and external real picture contrast hang down the problem of the unclear virtual image picture that leads to excessively, and the problem of the unclear external real picture that leads to with external real picture contrast under the indoor scene that light is weaker, thereby can be according to the luminousness and the reflectivity of ambient light intensity automatically regulated display lens, improve the contrast of display frame.

In the related art, the transparent display lens is a semi-transmission and semi-reflection curved screen, namely, the transparent display lens is a 50% proportion transmission curved screen, and the 50% proportion reflection curved lens is a curved lens, namely, the transmissivity and the reflectivity of the display lens are fixed and unchanged.

Alternatively, the electronic paper film layer element may be in the form of a sheet embedded inside the transparent display lens. The position and the area of the display lens occupied by the electronic paper element can be determined according to actual conditions. For example, an electronic paper element is provided on one of the display lenses of the AR glasses, occupying a local area in the center of the display lens.

In an embodiment, the e-paper film layer element comprises light colored charged particles, dark colored charged particles, and a transparent dispersion; the light-color charged particles and the dark-color charged particles are dispersed in the transparent dispersion liquid and are packaged in the closed cavity.

In the related art electronic paper film layer member, a bistable state, i.e., a dark state and a light state, is exhibited. Taking a black-white electronic paper film layer element as an example, the electronic paper film layer element presents black and white. For another example, in the color electronic paper film layer element, the color electronic paper film layer element may exhibit black, white, and a third color. However, the electronic paper film layer element in the technical scheme of the application can be colorless besides dark color and light color. When the transparent dispersion liquid is colorless, the dark charged particles and the light charged particles are gathered on the side wall of the closed cavity, so that most of the area in the closed cavity is colorless corresponding to the transparent dispersion liquid.

In an embodiment, the adjusting module is configured to adjust the electronic paper element when the ambient light intensity is higher than a preset threshold so that the light-colored charged particles are gathered on a side close to a human eye to present a light color, the dark-colored charged particles are gathered on a side far from the human eye to present a dark color, and when the ambient light intensity is lower than the preset threshold, the electronic paper element is adjusted so that the light-colored charged particles and the dark-colored charged particles are gathered on two sides to present a colorless color.

Use black electrophoretic particle to explain for dark charged particle, white electrophoretic particle explains for the example of light colored charged particle, when the ambient light intensity that detects is higher than predetermineeing the threshold value, adjusting module applys corresponding signal of telecommunication to electronic paper membrane layer component, black electrophoretic particle is to keeping away from people's eye one side directional movement under the effect of signal of telecommunication, white electrophoretic particle takes place directional motion to being close to people's eye one side, so that black electrophoretic particle gathering keeps away from the one side of people's eye at electronic paper membrane layer component, white electrophoretic particle gathering is close to the one side of people's eye at electronic paper membrane layer component.

The side, far away from human eyes, of the electronic paper film layer element presents black, at the moment, real image light emitted by an external real object can be absorbed by the black side of the electronic paper film layer element on the display lens, so that the light transmittance of the display lens is reduced, the real image light is reduced, and excessive real image light is prevented from being transmitted in a display area; meanwhile, the virtual image light is reflected by the white surface of the electronic paper film layer element, and the white surface has higher light reflection capacity, so that more virtual image light can be reflected, the virtual image light is increased, the contrast of a display picture is improved, and the quality of the display picture is improved.

When the detected ambient light intensity is lower than a preset threshold value, the adjusting module applies a corresponding electric signal to the electronic paper film layer element, and the black electrophoretic particles and the white electrophoretic particles move towards the side wall in an oriented mode under the action of the electric signal, so that the black electrophoretic particles and the white electrophoretic particles are gathered on the side wall as far as possible, and other areas of the electronic paper film layer element are in a transparent state.

In an embodiment, the black electrophoretic particles and the white electrophoretic particles are gathered in the area occupied by the sidewall as little as possible, at this time, the colorless electronic paper film element is similar to a transparent display lens, and the real image light emitted by the external environment can penetrate through the colorless electronic paper film element, so that the real image light can normally penetrate through the display lens and is hardly influenced by the electronic paper film element.

The electronic paper film layer element can change the transmittance and the reflectivity in a self-adaptive manner according to the ambient light intensity, and under the environment with high ambient light intensity, the light transmittance of the electronic paper film layer element is reduced, and the reflectivity is increased, so that the phenomenon that the visibility of a virtual image corresponding to the virtual image light is influenced because excessive external real image light is transmitted to a display image is avoided; under the environment that ambient light intensity is weak, the transmissivity of electron paper film layer component strengthens, and the reflectivity reduces to avoid because the transmissivity is low excessively to lead to light too dark, influence the visibility of the real image light correspondence's that the external environment sent external real picture.

It should be noted that, the adjustable optical element is embedded into the transparent display lens, and the side far away from the human eye presents black, and the side close to the human eye presents white, so that the adjustable optical element can absorb the external ambient light to the maximum extent, thereby avoiding the adverse effect of the light on the visibility of the virtual image picture or the visibility of the external real picture to the maximum extent. In an embodiment, the augmented reality display device further comprises an image projector;

in an embodiment, the augmented reality display device further comprises: an image projector.

The image projector is used for acquiring a locally stored virtual image and projecting virtual image light rays corresponding to the virtual image onto the reflecting surface of the display lens; the display lens is also used for reflecting the virtual image light rays so that the virtual image light rays are reflected to enter human eyes; the adjustable optical element is further used for changing the reflectivity of the virtual image light on the display lens.

In this embodiment, a reflective material is disposed inside the display lens 210 near the eyes to reflect light to the eyes. The virtual image of the augmented reality display device may be stored on a memory internal to the image projector or may be stored on a memory external to the image projector. The image projector acquires a locally stored virtual image, and projects virtual image light rays corresponding to the virtual image to the side, close to human eyes, of the adjustable optical element, so that the virtual image light rays are reflected by the side, close to the human eyes, of the adjustable optical element and then enter the human eyes, and a wearer can see the virtual image. Under the action of the electric signal, one side of the adjustable optical element on the display lens, which is close to human eyes, presents light color, such as white, so that the reflecting surface of the display lens can reflect more virtual image light, and the reflectivity on the display lens is improved.

In an embodiment, the image projector is located on a side of the display lens close to the human eye so as to project the virtual image light to the side of the adjustable optical element close to the human eye.

Because different users have different requirements on the contrast, the users can set different contrasts according to actual needs to obtain preset threshold values corresponding to the contrasts, such as standard ambient light intensity. Or a preset threshold set by default in the system. In an embodiment, the processing module may search a corresponding light intensity level according to a difference between the ambient light intensity and the preset threshold, and adjust the adjustable broadcast element with the driving electrical signal of the corresponding level, for example, the preset threshold is a light intensity of 10 units, and if the current ambient light intensity is a light intensity of 20 units, the driving electrical signal of a first level, for example, 30V, is correspondingly applied; if the current ambient light intensity is 40 units of light intensity, a second level of driving electrical signal, such as 60V, is applied correspondingly, so that the depth of the color presented in the adjustable optical element is different, for example, under the action of a high driving electrical signal, the charged particles move more strongly, and the color depth of the dark color surface is higher than that of the dark color surface under the action of a lower driving electrical signal, thereby realizing the presentation of colors of different gray scale levels.

the camera is used for collecting a real image corresponding to the real image light after penetrating through the display lens; the image processing module is connected with the camera and used for acquiring the real image and the locally stored virtual image, fusing the real image and the virtual image and rendering to obtain an augmented reality display picture.

In an embodiment, the augmented reality display device includes a camera, and the camera may be disposed on a side close to the human eye, so as to collect a real image corresponding to the light of the real image after passing through the display lens. Optionally, the camera includes a light sensor and a processor, and the light sensor can sense real image light passing through the display lens and convert the real image light into a corresponding physical signal, so that the processor converts the physical signal into a corresponding real image.

Further, the image processing module acquires the real image and the locally stored virtual image, superimposes the real image and the virtual image to obtain an augmented reality display picture, and transmits the display picture to a display screen of augmented reality display equipment for playing, wherein optionally, the display screen is arranged on the display lens.

To more clearly illustrate the present application, the present solution is described below with reference to the following drawings and examples.

Fig. 4 is a schematic structural diagram of an AR eye according to an embodiment, and as shown in fig. 4, the AR eye 30 includes a display lens 210, the display lens 210 is provided with an adjustable optical element 110, and further includes an image projector (not shown).

Fig. 5 is a first schematic diagram of an adjustable optical element in an AR-based eye, where the side of the adjustable optical element away from the human eye appears black due to the aggregation of black particles and the side closer to the human eye appears white due to the aggregation of white particles, as shown in fig. 5, when the ambient light intensity is high. After real image light rays T1 from an external real object penetrate through the display lens, a considerable part of light rays are absorbed by a black surface, far away from human eyes, of the adjustable optical element, so that the real image light rays T1 ' penetrating through the adjustable optical element are greatly weakened, and after virtual image light rays P1 from the image projector are projected to the display lens, the virtual image light rays P ' are reflected by a white surface, close to the human eyes, of the adjustable optical element, so that the reflected virtual image light rays P ' are strengthened, the light transmittance of the display lens is reduced, the real image light rays are reduced, and excessive real image light rays are prevented from being transmitted in a display area; the reflectivity of the display lens is improved, the virtual image light is increased, the contrast of a display picture is improved, and the quality of the display picture is improved.

Fig. 6 is a second functional diagram based on an adjustable optical element in an AR eye. As shown in fig. 5, when the ambient light intensity is low, the black particles and the white particles move laterally to gather the side of the adjustable optical element, so that the adjustable optical element is in a colorless transparent state, and the real image light can normally transmit through the display lens and is hardly influenced by the adjustable optical element. After the real image light ray T2 of the real object from the outside passes through the display lens and passes through the colorless transparent region of the adjustable optical element, more real image light rays T2 'can pass through, and after the virtual image light ray P2 from the image projector is projected onto the display lens, the reflected virtual image light ray P2' is obtained. Compared with the case of the example of fig. 5, the real image light ray T2 and the virtual image light ray P2 in this example are less affected by the adjustable optical element, so that the transmitted real image light ray T2 '> T1' and the reflected virtual image light ray P2 '< P1' can allow enough external ambient light to transmit into human eyes when the ambient light intensity is low, and a user can see the external real picture through the transparent adjustable optical element.

It will be understood that when an element or layer is referred to as being "on" or "connected to" another element or layer, it can be directly on or connected to the other element or layer or intervening elements or layers. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element or layer, there are no intervening elements or layers present. As used herein, "connected" includes physically and/or electrically connected. Like numbers refer to like elements throughout. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present application.

An element described as "below" would be oriented "above" relative to other elements or features. Thus, the exemplary term "below" can include both an orientation of above and below. The apparatus may end up in other ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein accordingly.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, and/or components.

Embodiments of the present application are described herein with reference to schematic drawings, which are schematic illustrations of idealized embodiments (and intermediate structures) of the present application. Thus, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or equations, are to be expected. Thus, embodiments of the invention should not be construed as limited to the particular shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The foregoing is only a partial embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. An optical device, comprising: the device comprises an adjustable optical element, a light sensing module and an adjusting module; the adjustable optical element is a film-shaped adjustable optical element;

2. The optical device of claim 1, wherein the adjustment module is further configured to adjust the adjustable optical element such that a partial area of one side of the adjustable optical element is light and a partial area of the other side of the adjustable optical element is dark.

3. The optical device according to claim 1, wherein the adjustable optical element comprises a first transparent substrate, a dielectric layer and a second transparent substrate, the dielectric layer being located between the first transparent substrate and the second transparent substrate, at least one of the first transparent substrate and the second transparent substrate having a transparent electrode disposed thereon;

4. The optical device according to claim 3, wherein the transparent electrode comprises a surface electrode and at least two strip-shaped electrodes distributed at intervals, and the surface electrode and the strip-shaped electrodes are insulated from each other;

5. The optical device of claim 4, wherein the adjustment module comprises a first drive unit and a second drive unit;

the first driving unit is connected with a surface electrode of the adjustable optical element and used for applying a first electric signal to drive the light-color charged particles and the dark-color charged particles to move towards a direction perpendicular to the first transparent substrate or the second transparent substrate, so that the light-color charged particles are gathered on one surface of the first transparent substrate or the second transparent substrate, close to the adjustable optical element, in the closed cavity to enable the surface to show a light color, and the dark-color charged particles are gathered on the other surface of the first transparent substrate or the second transparent substrate, close to the adjustable optical element, in the closed cavity to enable the other surface to show a dark color;

the second driving unit is connected with the strip-shaped electrode of the adjustable optical element and used for applying a second electric signal to drive the light-color charged particles and the dark-color charged particles to move in a direction parallel to the first transparent substrate and the second transparent substrate, so that the light-color charged particles and the dark-color charged particles are gathered on a surface, close to the side of the adjustable optical element, in the closed cavity, and the adjustable optical element is colorless.

6. The optical device of claim 1, further comprising: a transparent lens;

the adjustable optical element is embedded within the transparent lens; or the like, or, alternatively,

the adjustable optical element is applied to the surface of the transparent lens.

7. An augmented reality display device comprising the optical apparatus of any one of claims 1 to 6, further comprising a display lens; the adjustable optical element is positioned on the transparent display lens;

8. The augmented reality display device of claim 7, further comprising: an image projector;

9. The augmented reality display device of claim 7, further comprising: a processing module;

10. The augmented reality display device of claim 8, further comprising: the camera and the image processing module;